Java Reader skip(long)方法及示例

Java中Reader类的skip(long)方法是用来跳过流中指定的字符数的。这个数量的字符被指定为参数。如果它跳过的字符数达到了流的末端，它将阻塞流，直到获得一些字符，或者抛出IOException。

语法。

public long skip(long numberOfChar)

参数。该方法接受一个参数numberOfChar，它是该方法要跳过的字符数。

返回值。此方法返回一个长值，即此方法跳过的实际字符数。

异常情况。这个方法会抛出。

IOException：如果在输入输出时发生一些错误
IllegalArgumentException：如果传递的numberOfChar是负数。

下面的方法说明了skip(long)方法的工作。

程序 1:

// Java program to demonstrate
// Reader skip(long) method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
  
            String str = "GeeksForGeeks";
  
            // Create a Reader instance
            Reader reader
                = new StringReader(str);
  
            // Get the character
            // to be read from the stream
            int ch;
  
            // Read the first 5 characters
            // to this reader using read() method
            // This will put the str in the stream
            // till it is read by the reader
            for (int i = 0; i < 5; i++) {
                ch = reader.read();
                System.out.print((char)ch);
            }
  
            System.out.println();
  
            // skip 3 characters using skip(long)
            reader.skip(3);
  
            System.out.println("Next 3 characters skipped.");
  
            // Read the 5 characters
            // to this reader using read() method
            for (int i = 0; i < 5; i++) {
                ch = reader.read();
                System.out.print((char)ch);
            }
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

输出:

Geeks
Next 3 characters skipped.
Geeks

程序2。

// Java program to demonstrate
// Reader skip(long) method
  
import java.io.*;
import java.util.*;
  
class GFG {
    public static void main(String[] args)
    {
  
        try {
            String str = "GeeksForGeeks";
  
            // Create a Reader instance
            Reader reader
                = new StringReader(str);
  
            // Get the character
            // to be read from the stream
            int ch;
  
            // Read the first 5 characters
            // to this reader using read() method
            // This will put the str in the stream
            // till it is read by the reader
            for (int i = 0; i < 5; i++) {
                ch = reader.read();
                System.out.print((char)ch);
            }
  
            System.out.println();
  
            // skip 10 characters using skip(long)
            reader.skip(10);
  
            // Read the 5 characters
            // to this reader using read() method
            for (int i = 0; i < 5; i++) {
                ch = reader.read();
                System.out.print((char)ch);
            }
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}